Compressor apparatus



May 27, 1924. 1,495,290

W. H. E PPERSON COMPRESSOR APPARATUS Filed May 2., 1921 INVENTOR. Ma a; flfija varsm Patented May 2?. 192a WILLIAM a. memoir, or SACRAMENTO, CALIFORNIA.

comranssoa Arrm'ru's.

Application filed Kay 2,

To all whom it may concern:

Be it known that I, WILLIAM H. EPPER- SON, a citizen of the United'States, and a resident of Sacramento, county of Sacramento, and State of California, have invented anew and useful Compressor Apparatus, of which the following is a specification.

My invention relates to single acting com pressors of the piston type and particularly to means for packing the piston rod in the cylinder.

An object of the invention is the provision of means for hermetically sealing the piston rod end of the cylinder without interfering in any. way with the free movement of the piston rod nor passing the piston rod thru the usual type of packing boxes possible to prevent escape of more or less which are only relatively tight. Another object of the invention is the provision of an improved compressor particularly suitable fer usein refrigerating apparatus. In apparatus of this character, one of the most important problems is to revent the leakage of the refrigerant. n most of these devices the compressor shaft passes thru a stufling box and it has been found imrefrigerant material passes being completelysealed.

My invention possesses. other objects and features of advantage, some of which with the foregoingpwill be set forth in the fol-.

lowing description of my invention. It is to be understood that I do not limit myself to the showing made by the said description, as I may adopt variant forms of my invention within the scope of the claims.

In the drawings, Fig. 1 isfa vertical sectional view of. m compressor apparatus. Fig. 2 is a vertica sectional view-of a; portion of a small refrigerator, in which my compressor finds one of its chief applications;

vMy compressor comprises a cylinder 2 able material.

1921". Serial No. 466,062.

having a flaring lower edge 3 and mounted in a vertical position upon the" bed'plate 4, conveniently set in the bottomportion of the refrigerator 6, which is of known type, and which therefore needs no detailed description. 7 isslidablv arranged in the cylinder and is provided with a check valve 8 in the cross wall thereof to permit the passage of gases from the chamber'below the piston to .the chamber above-the piston on its downward stroke.

The upper end of the cylinder is closed by the head 9 into which is'connected, thru a check valve, the pipe 11, which joins the compression chamber of the cylinder to the condensing coils .12, emptying into the receiver 13. .The receiver is connected by pi e 14-, including the expansion valve 16, to t 0 expansion coil 17, the end of which is connected by pipe 18 into the chamber below A single acting piston 1 the piston. The inlet passage provided by the pipe 18 opens into the cylinder imme-- diately below the piston in its lowe-r'position, and preferably, at the point where the lower edge of the cylinder begins to flare outwardly.

The piston rod for moving the iston is prefera ly formed in two parts, tie inner part 21 pivotally connected to the piston in the usual way at its upper end and terminating at its -lower end in a-flange or head 22. The other half of the piston rod is of similar construction, being provided with a head 24 adapted to be bolted to-the head 22 with the rods in alinement and .terminat-.

ingat its other end in a suitably formed eye forconnection with the lever 26 mounted with the driving gear .27 and motor 28 upon the bed plate. Interposed between the" two heads 22 and 24- is a flexible sheet or diaphragm 29 of leather, rubber, or other suitthe heads 22 and 24 together, of course pass The bolts 31 which secure,

thru 'the diaphragm, but the compression I "ofthe heads upon the material of the diaphragm is sufiicient to form a tight closure about the bolts. The outer edge of thediaphragm seat is secured tightly to the flared end of the cylinder bymeans of a clamp ring 32, held by bolts to the flange of the cylinder. -Here also the diaphragm acts as its own gasket to. form a tight 'oint witlrthe flange' The diaphragm is t us fixed at a point within its edge to the piston rod in- .termediate the ends thereof, and the edge piston rod is permitted free movement while at the same time the end of the cylinder is hermetically sealed.

If .leather or other porous material is used for the diaphragm ll deposit onthe in- "side thereof, a'thin layer 33 of Chinese clay or comparable material, and glycerin. Over this ll then fill in a layer of glycerin 3d. The clay is for the'purpose of filling the pores of the diaphragm to render it impervious and the glycerin which is inert in the presence of the refrigerant usually used, prevents therefrigerant from attacking the diaphragm. It is ofcourse understood that any other suitable materials may be substituted for either the clay or the glycerin.

In case it use rubber, or leather which has been-treated to render it impervious, for

the diaphragm ll will not use the clay coat:

ing but in this case I will use the protective layer of liquid which is inert in the presence of the refrigerant.

From the above it will be. clear that in raasgaeo operation the piston is reciprorated hy' the piston rod in a manner not at all difierent from the usual construction of piston and piston rod, and the diaphragm will-follow the piston hack and forth not interfering with its movement but hermetically sealing the lower portion of the cylinder.

' ll claim;

1. The combination with a cylinder and piston therein, of a piston rod formed in two pieces adapted to be secured tpgether, a leather diaphragm interposed between the two pieces, means for securing the edge or the diaphragm to the cylinder, a layer of clay on the diaphragm and a layer of glycerin on the clay.

2. A compressorcomprising a cylinder, apiston in said cylinder, a rod for moving said piston, means for actuating said piston rod, a flexible diaphragm fixed to the piston rod and fixed at its edge to the cylinder, a layer of sealing material on said diaphragm, and a layer ofprotective liquid on said sealing material.

In testimony whereof, l have hereunto set my hand.

WILLIAM H. irrrnnson. 

